Telephone-transmitter.



N. TANNAKA.

TELEPHONE TRANSMITTER.

APPLICATION FILED NOV. 11, 1915.

Patented June 26 1917.

NAHO TANNAKA, OF NEW YORK, N. Y.

TELEPHONE-TRANSMITTER.

Specification of Letters Patent.

Patented June 26, 191?.

Application filed November 11, 1915. Serial No. 60,946.

Y '0 all to hem it may concern:

Be it known that I, Nano TANNAKA, a subject of the Emperor of Japan, residing at New York, in the county oi" New York and State of New York, have invented new and useful Improvements in Telephone- Transmitters, of which the following a full. clear, and exact description.

This invention relates to improvements in variable resistance devices for application particularly to telephone transmitting apparatus, for the purpose of increasing the efliciency of. the apparatus in such manners that the effective cross section of the Variable resistance means is enlarged in order to enable the instruments advantageously to carry heavier currents without injury there to or to increase the resistance variability thereof, while the ap 'iaratus are similarly eii'cctivc with low battery currents, and that the original voice and sound may be transniittcd' with least or no modification.

l adapt the diaphragm. or other vibrator of such an apparatus to vibrate simultaneously at the cent 'al and. outer portions thereof by employing certain flexibly mountmeans for the vibrator and other mov- 1 1 parts, and construct the diaphragm or vibrator light as possible, so that the inertia thereor" will. not be detrimental in operation, and also in order to increase the electrodesurface, I extend the carbon contact means to the outer portion of vibrator pretcralily in a plural form.

The particular object of the invention is to provide telephone transmitters which have greater carrving capacity of battery greater \ariabilitv (ii -"resistance,

which voice and sound are more transmitted than with ordinary instruments.

ldlltl'lfll object is to provide apparatus of the class named which. are d urablo and reliable without becoming packed.

Vi ith the above and other objects in View, my invention resides in the peculiar combination and arrangement of parts, and comprises certain. detail of constructions, as will be hereinafter more fully described, illustrated, and. claimed. I

he inrenthsn will be best understood.

from the following description, taken in connection with the accompanying drawingzjs as reference, formingapart of this s 'ieeification. However, l desire to have it mderstood that the, apparatus shown herein are merely illustrative, and that therefore I do .not confine myself to any strict conformity with the showing ot' the draw ings, but such changes and inmlifications may be made, when desired, as to fall within the scope of the invention claimed.

1n the drawings, similar numerals. ot' rel erence indicate similar parts in all the views, and. in'whicl1- Figure 1 represents a vertical central section of a transmitter embodying my invention,

Fig. 2 shows a modification of the apparatus, my improv ments applied thereto, being a similar view to Fig. 1.

Fig. 3 is a back view of the vibrator part of Fig. 2, and

Fig. 4: is a front vie of the back electrode part of the same.

Referring tothe drawings. the numeral 10 designates a bridge or cup clamped with a front piece ll constituting a casing. The front piece ias a preferably large opening: which is sorew-threaded to receive an usual mouth-piece This opening is closed by a. film 18 of moisture proot' i'naterial to protect the working-4' parts within the casing.

A lizr )lii':\gi'11 or vibrator 13 which is lo catcd in the front portion ofthe casing! carrics as a part therooi front electrodes 14 on somewhat raised pm'tions, clamping an clastic sheeting 17 therebetwemi. such as mica sheeting (see Fig. l) and is shown in Fig. 2 in a form oi plnrally cup-shapcd or depressed dish of suitable solid material, for instance stamped out of metal, preferably aluminum, having thin carbon electrodes l-l- (soldered thereon aiter electroplating), as parts therein? at the botton'is of the (lo-- pressed portions which are extended to the outer portion of the vibrator. 1 herein emplot a vibrator to mean a diaphragm or other ibrator, as it may not be proper to call it a diaphragm in such a construction, when the edge portion thereof is not fixed and it is not a lain disk as later will be referred to.- 7

At the roar of the vibrator 13 in parallel therewith is disposed an electrode support or hearing plate 15 (of insulating material in the present instances, or of carbon or metal when suitable to use) which is depressed or shaped at front so as to form a number of cups or chambers, having back electrodes 'JGof carbon in the cups or chambers (Fig. l). The back electrode part 15 disclosed in and (less:

.bon cells are of course suse is attached to the sheeting 17, so that the necessary relative movement between the vibrat-or l3 and .the back electrode part 15 is permitted by the fiexing or" the sheeting, each front electrode being arranged to confront one of the back electrodes 16 in the chamber which is closed thereby, In Fig. 2 back electrodes are placed in parallel with the front electrodes 14 in a manner to close ing by means of springs 20. The peripheral.

edge or the sheeting 17 is held between. cup and the front piece 11, flexibly connecting the working parts and the casing. By employment of the springs, the connection between the sheeting 17 and the back electrode part may be omitted, the leakage of the carbon. being prevented by the narrowness of the distal cc, if any, left between, or by the close contact between them each pressing toward the other. Also the working part may be wholly supported by the springs when desired. In Fig". '2, the working parts are cushioned at the front by a ring washer 21 of soft elastic material.

such as felt or pneumaticrubber, and at the back by snnilar washer 22 or spring 20,

as in Fig. 1.

As adjusting means of. pressure on the washers or cushions as well on the granular carbon, an aojusting plate 24 is provided, having an arm 25 at the center which passes through the tubular portion 23 ot the cup or bridge 10, and tits almost snugly in the tube bein, omble o. ly in the direction. of the tube 15, when the screw on tube is loosenee.

lVhile have shown and r. some of inodilicatiens of parts there-ct, the construction and embed herein.

oi the a armors similarly applicabm to though 1 have shown modification each i tact cells, the form an 'in l ,xtibie to; anger, whenever desired.

a the construction as ab incidence of vocal Waves on the action of the variable diums in varying their r substantially uniform th.

upon the vibrator, ice be whole cross section thereof, and the vibrator will respond substantially only to the pulsations comingthrough the mouth piece 12 practically without being molested by the natural vibration thereol and external vibrations. p

The carbon contact cells may be connected either in multipleseiies, in series (provided the vibrator is made oi nonconductive material}, or in parallel as it is the case When the vibrator and the back support are conductiv and the electrodes are not insulated therefrom. The terminals of the connection are led out to two insulated binding screws (not shown) on the casing.

From the foregoing description, taken in connection with the accompanying drawings, the advantages of the construction and arrangement of parts, and the method of operation, in which vocal vibrations are translated into electrical impulses, will be readily apparent without further explanations to those skilled in the art to which this invention appertains.

Having thus described the invention, I claim:

1. In a telephone transmitter, a vibrator having cup-shaped or depressed portions and hearing front electrodes in the said portions, an elastic or flexible sheeting, attached thereto, back electrodes attached to the sheeting within the inclosures formed by the sheeting and the said portions and secured together by'a plate or disk, a casing holding the peripheral edge of the sheeting,

2%, in a variable resistance device, the eornbinati n of a casing, an elastic sheetin? he 7 the; l i i b I electrr p siniped and to be relativ be reen ed 0 thblc and e electr c m aisrnitter, 6

W stic sheeta back e1ecv nob inelose the so as in flexible concans between the he casing; with so that the latter two members are relatively movable, a spring means bridging or connecting the back electrode part and the casing; with carbon balls or grains disposed inthe chambers and in contact with the electrodes.

6. In a telephone transmitter, the combination of a vibrator and a back electrode part, both including electrodes as parts thereof, shaped so as to form chambers which inclose the electrodes in pairs, an elastic sheeting attached thereto to flexibly join the said two parts and to close the chambers, and a casing holding the peripheral edge of the sheeting; with variable resistance mediums in contact with the electrodes.

7," In a telephone transmitter, the combination of front and back vibratory plates, cases or chambers mounted on one of the said plates, primary electrodes attached to the cases or chambers, secondary electrodes attached to the other vibratory plate, each confronting one of the primary electrodes, a

casing, an elastic or flexible sheeting held' by the casing and attached to the plates so as to flexibly connect them together and to close the cases or chambers; with variable resistance mediums disposed in the cases or chambers in contact with the electrodes therein.

8. In a telephone transmitter, a vibratory plate and a back electrode part shaped and disposed to form chambers therebetween, a yielding washering held between to close the chambers, a casing, an elastic sheeting attached to the vibratory plate and the casing, spring means attached to the back electrode part and the casing, and variable resistance mediuins in the chambers. I

9. In a telephone transmitter, the combination of" a vibratory plate having cupshaped or depressed portions, a back electrode part, flexibly secured to a support, and an elastic sheeting clamped to the back electrode part and the vibratory plate and-dis posed so as to form with the said plate" 10. In a telephone transmitter, the combination with a casing, a vibratorand a back electrode part both having electrodes in. chambers formed therebetween, an elastic sheeting held therebetween and attached to the casing, and variable resistance mediums between the electrodes; of a cushion mounting for the above parts as a whole sulficiently flexible so as to allow the vibrator to-vibrate substantially bodily in the intended operation.

11. In a telephone transmitter, the combi+ nation with a casing, and resistance varying means for transmittingsound, including a vibratory body, and a back electrode part; of spring members flexibly connecting the vibratory body and the back electrode part to the casing.

12. In a telephone transmitter, the comelastic sheeting held by the casing at the pe-.-,

ripheral edge and attached to the front plate, spr1ng members attached to the casing and the back plate, and a yielding or pliable washering held between the plates. 13. In a telephone transmitter, the cbmbination of two vibratory plates, chambersor cases carried by one of said plates as a part thereof and resiliently or flexibly attached to the other, and. a support flexibly secured to one of the said plates; with variable resistance mediums in the chambers or cases.

14:. In a telephone transmitter, a casing, a front vibratory plate, a back plate the pe ripheral edge of which is free to vibrate resiliently secured to the casing, carbon cells rigidly carried by one of the said plates, and resiliently attached to the other plate.

In testimony whereof I aflixmy signature in presence of two subscribing Witnesses.

NAHO TANNAKA.

Witnesses:

SAMUEL ABRAHAM, KAIMON TAKEUGHI. 

